/Engine/Plugins/FX/Niagara/Source/NiagaraEditor/Public/Customizations/NiagaraEventScriptPropertiesCustomization.h
void ChangeEventSource ( [FGuid](API\Runtime\Core\Misc\FGuid) InEmitterId, [FName](API\Runtime\Core\UObject\FName) InEmitterName, [FName](API\Runtime\Core\UObject\FName) InEventName )